The only real factor is that of wing-loading. Wing-loading is the lift factor of the wing in relation to the weight of the aircraft (someone will prolly give a better explanation). The planes with low wing-loading have a better SUSTAINED turn advantage - ie at slow speeds. Planes with a high wing-loading do not turn so well at slow speeds.
So, the planes that have a low wing-loading are the ones you want to try to press a turn-fight with, and the ones that dont are the ones you want to avoid hard turning in.
SUSTAINED turn performance is a relative concept. Ie a P-51 will beat a B17 in a sustained turn match, where as a spit will maul a p51 in a sustained turn match, where a zeke will eat a spit etc etc etc.
As (dubious) rough rule of thumb: the better the sustained turn performance a plane has the slower it is in top speed. Although this is not always the case. Its has more to do with design philosophies and engine/propellor/wing performance as the war progressed.
Late model fighters tend to sacrifice sustained turn performance for improvements in speed, range, and instantaneous turn performance. They tended to get heavier and faster.
Bottom line: Know the plane you fly, know its relative SUSTAINED turn ability to other planes you will likely encounter. This means a bit of homework/learning-curve. Know when to press a turn-fight home, and when to adopt another tactic (ie Energy fighting - which is another matter all together).
Note i mention SUSTAINED turn rate. This is different from instantaneous turn-rate. Again, this is another matter.
